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首页> 外文期刊>Atmospheric chemistry and physics >Now you see it, now you don't: Impact of temporary closures of a coal-fired power plant on air quality in the Columbia River Gorge National Scenic Area
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Now you see it, now you don't: Impact of temporary closures of a coal-fired power plant on air quality in the Columbia River Gorge National Scenic Area

机译：现在您看到了，现在您没有了：哥伦比亚河峡谷国家风景区临时关闭燃煤电厂对空气质量的影响

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The goal of this study is to identify major point sources that contribute to elevated particulate matter in the Columbia River Gorge, USA and to quantify their contribution. To answer this question we analyzed 14 years of aerosol data spanning 1993-2006 from the IMPROVE site at Wishram, Washington (45.66° N, 121.00°W; 178ma.s.l.) in the Columbia River Gorge (CRG) National Scenic Area of the Pacific Northwest of the USA. Two types of analyses were conducted. First, we examined the transport for days with the highest fine mass (PM2.5) concentrations using HYSPLIT backtrajectories. We found that the highest PM2.5 concentrations occurred during autumn and were associated with easterly flow, down the CRG. Such flow transports emissions from a large coal power plant in Boardman, Oregon and a large agricultural facility into the CRG. This transport was found on 20 out of the 50 worst PM2.5 days and resulted in an average daily concentration of 20.1μg/m3, compared with an average of 18.8μg/m3 for the 50 highest days and 5.9μg/m3 for all days. These airmasses contain not only high PM2.5 concentrations, but also elevated levels of aerosol NO-3. In the second analysis, we examined PM2.5 concentrations in the CRG during periods when the Boardman power plant was shut down due to repairs and compared these values with concentrations when the facility was operating at near full capacity. We also examined this relationship on the days when backtrajectories suggested the greatest in-fluence from the power plant on air quality in the CRG. From this analysis, we found significantly higher PM2.5 concentrations when the power plant was operating at or near full capacity. We use these data to calculate that the contribution to PM2.5 mass in the CRG from the Boardman power plant was 0.90μg/m3 averaged over the entire year, 3.94μg/m3 if only the month of November is considered and 7.40μg/m3 if only November days when the airflow is "down-gorge" (from east to west). This represents 14, 46 and 56% of the PM2.5 mass in the CRG for the full year, November only and November days with "down-gorge" transport, respectively.
机译：这项研究的目的是确定导致美国哥伦比亚河峡谷颗粒物含量升高的主要点源，并对其贡献进行量化。为了回答这个问题，我们分析了14年来1993-2006年间在太平洋哥伦比亚河峡谷（CRG）国家风景名胜区位于华盛顿Wishram（45.66°N，121.00°W; 178ma.sl）的IMPROVE站点的气溶胶数据。美国西北部。进行了两种类型的分析。首先，我们使用HYSPLIT回弹轨迹检查了最高质量数（PM2.5）浓度最高的运输日。我们发现最高的PM2.5浓度发生在秋季，并且与CRG下游的东风有关。这种气流将来自俄勒冈州博德曼的大型燃煤发电厂和大型农业设施的排放物输送到CRG。在50个最差的PM2.5天中，有20个被发现存在这种迁移，导致平均日浓度为20.1μg/ m3，而最高的50天的平均日浓度为18.8μg/ m3，所有天的平均浓度为5.9μg/ m3 。这些气团不仅含有高浓度的PM2.5，而且还含有较高水平的NO-3气溶胶。在第二项分析中，我们检查了由于维修而关闭Boardman电厂的期间，CRG中的PM2.5浓度，并将这些值与设施接近满负荷运行时的浓度进行了比较。在反向轨迹表明电厂对CRG的空气质量影响最大的日子，我们还研究了这种关系。通过该分析，我们发现发电厂在满负荷运行或接近满负荷运行时，PM2.5浓度明显更高。我们使用这些数据来计算，Boardman电厂对CRG中PM2.5的贡献为全年平均值，为0.90μg/ m3，如果仅考虑11月，则为3.94μg/ m3，而对7.40μg/ m3的贡献为7.40μg/ m3。如果只有十一月的日子，气流是“向下峡谷”（从东到西）。这代表在全年，仅11月和11月的CRG中PM2.5的14、46和56％的质量，分别为“下降峡谷”运输。

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